In a large mixing bowl, sift together dry ingredients. Whisk in the brown sugar. Set aside.
In another bowl, whisk together egg yolks,oil,buttermilk,and vanilla. Gently combine with dry mixture.
In a medium mixing bowl, beat egg whites until stiff.
Gently fold the egg whites to batter.
Heat waffle iron. Spray with non-stick spray.
Pour about 1/4 - 1/3 cup for each waffle. (I use a large serving ladle and drop the batter in the middle of the waffle iron).
Cook 2-3 minutes or until golden brown.
Place on a rimmed baking sheet and transfer to oven to keep warm (set oven to 200℉/93℃).
Serve with your favourite toppings.
You can replace up to 1 cup of the all purpose flour with whole wheat flour. Special equipment required: waffle iron1 serving = 1 wafflePlease keep in mind that the nutritional information provided below is just a rough estimate and variations can occur depending on the specific ingredients used. *adapted from Martha Stewart